Datasheet

59
Series PF2D
Specific Product Precautions 2
Be sure to read before handling.
Refer to page 57 for safety instructions and precautions.
Wiring
Usage
Warning
Operating Environment
1. Never use in the presence of explosive gases.
The switches do not have an explosion proof rating. Never use
in the presence of an explosive gas as this may cause a
serious explosion.
2. Mount the switch in a location where there is
no vibration (Display: greater than 98 m/s
2
,
Sensor: 4.9 m/s
2
or less), or no impact
greater than 490 m/s
2
.
3. Do not use in an area where surges are gene-
rated.
When there are units that generate a large amount of surge in
the area around a pressure switch, (e.g., solenoid type lifters,
high frequency induction furnaces, motors, etc.) this may cause
deterioration or damage to the switch’s internal circuitry. Avoid
sources of surge generation and crossed lines.
4. Switches are not equipped with surge protec-
tion against lightning.
The flow switches are CE compliant; however, they are not
equipped with surge protection against lightning. Lightning
surge protection measures should be applied directly to system
components as necessary.
5. Avoid using the switch in an environment
where the likelihood of splashing or spraying
of liquids exists.
The switches are dustproof and splashproof; however, avoid
using in an environment where the likelihood of heavy
splashing or spraying of water and/or oil exist. Since the display
unit of the remote type switches featured here is not dust or
splash proof, the use in an environment where water and/or oil
splashing or spraying exists must be avoided.
Warning
Maintenance
1. Perform periodical inspections to ensure
proper operation of the switch.
Unexpected malfunctions may cause a possible danger.
2. Take precautions when using the switch for
an interlock circuit.
When a pressure switch is used for the interlock circuit, devise
a multiple interlock system to prevent trouble or malfunction.
Verify the operation of the switch and the interlock function on a
regular basis.
3. Do not disassemble or perform any conver-
sion work on flow switches.
4. The following should be observed during
regular maintenance to avoid damage and
loss due to chemicals.
a) Do not touch the remaining chemicals in piping and/or digital
flow switch.
b) Check the name and the nature of chemicals used and treat
them accordingly.
1. Verify the color and the terminal number
when wiring.
Incorrect wiring can cause the switch to be damaged and
malfunction. Verify the color and the terminal number in the
instruction manual when wiring.
2. Avoid repeatedly bending or stretching of the
lead wire.
Repeatedly applying bending stress or stretching force to the
lead wire will cause it to break.
3. Confirm proper insulation of wiring.
Make sure that there is no faulty wiring insulation (contact with
other circuits, ground fault, improper insulation between
terminals, etc.). Damage may occur due to excess current flow
into a switch.
4. Do not wire in conjunction with power lines or
high voltage lines.
Wire separately from power lines and high voltage lines,
avoiding wiring in the same conduit with these lines. Control
circuits including switches may malfunction due to noise from
these other lines.
5. Do not allow loads to short circuit.
Although a switch indicate excess current error if a load is short
circuited, all incorrect wiring connections such as power supply
polarity cannot be protected. Take precautions to avoid
incorrect wiring.
Warning
Warning
1. When using a switch for high temperature
fluid, the switch itself also becomes hot due
to the high temperature fluid. Avoid touching
the switch directly as this may cause a burn.